General Description: This Philips 70 watt protected pulse start coated metal halide lamp requires a M143 / M98 / O ballast to operate and is rated for enclosed or open fixtures. It will produce up to 5900 lumens of light and is engineered to last for 20,000 hours on average. The "MasterColor" technology allows for very little color shift of the light (+/- 200K) over the lamps life. It has a 4200K color temperature making for a cool white color light.